Motherboard Polymer Chip Capacitor replacement

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Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Tue Sep 06, 2016 9:25 pm

Hi.
While removing CPU cooler accidentally broke CONDUCTIVE POLYMER CHIP CAPACITOR # KO 157 6K 236.
It's Dell Precision t3600 Server, chip is located nearby CPU itself.
It's yellow and square, one side lightly longer than another size 3/8" x 3/16 with short side legs.
Similar like this
https://www.amazon.com/Tantalum-Capacit ... 157+6K+236
Couldn't find it even at Ebay. Can i replace it by something similar?
I got similar chip KO 157 6K 527 instead 236. Will it work?
Thanks.
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Re: Motherboard Polymer Chip Capacitor replacement

Postby Karlsweldt » Wed Sep 07, 2016 5:08 am

Has to be the exact same values of voltage and capacitance, heat limit can be higher.
Filtering caps can be a bit different from original, as long as the ripple factor and reserve are not affected.
Coupling capacitors are designed for a specific need, and if different from intent, can cause problems with signal (data) and timing transfer.
The "KO" part may refer to the manufacturer brand. Did a quick search for "CAPACITOR KO 157 6K 236", several links.
Try http://www.mouser.com/ or http://www.digikey.com/ or https://www.ttiinc.com/ .
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Re: Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Wed Sep 07, 2016 3:40 pm

Thanks.
What did i find out: http://www.farnell.com/datasheets/718274.pdf
Also http://www.digikey.com/Web%20Export/Sup ... mSMCap.pdf
From where markings at lower level 512 means
512 = 12th week of 2005 ( Print Week Code: 1st Digit = Year, 2nd & 3rd Digits = Week, "513" = The 13th week of 2005)
KO-KEMET Organic SIMILAR
157- Picofarad Code SIMILAR
6k- (6-Rated Voltage) (k-KEMET ID) SIMILAR

If this is correct then CAPACITORS KO "157 6K 236" and "KO 157 6K 527" are same just manufactured date is different.
Can you double check please.
Thanks.

P.S. Broke that one too, i really need to invest in Rework Station.

Should this cause BSOD ? I had it almost every day and was blaming everything: SSD, MEMORY, Windows OS, reinstalling it almost every month LOL.
Dell Technician changed Motherboard for me 7 months ago and since it i had Blue Screens and freezes every day.
Locks like he broke it while installing CPU cooler (sits next to CPU coolers screw).
Call to DELL and "0" support LOL.
Now go and buy DELL AGAIN, NEVER EVER DELL.
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Re: Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Wed Sep 28, 2016 2:24 pm

Hi guys, TV repair shop installed for me instead that yellow flat capacitor( 157 6k) by regular round one 220 UF 6.3v .
Do you thing this will do the job?
Any surprises i should expect?
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Re: Motherboard Polymer Chip Capacitor replacement

Postby Karlsweldt » Wed Sep 28, 2016 4:15 pm

I would expect problems, if not the same. The original was a low-ESR Tantalum type, configured for the circuit coupling needs.
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Re: Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Wed Sep 28, 2016 6:00 pm

Can you help me to find replacement online please. I couldn't, don't know that much.
Thanks.

P.S. What about this one?
http://www.mouser.com/ProductDetail/ROH ... REBA%3d%3d

or this but it.s 150 uf 16v

TPSD157M016R0125

Capacitance: 150uF
Voltage Rating: 16V
ESR: 125 mOhms
Tolerance: 20%
Operating Temp. Range: -55C to +125C
Package / Case: 2917 (7343-31 metric)
Dimensions: 4.3mm W x 7.3mm L
Height: 2.9mm
Series: TPS
Mfr Case Code: D Case
Dissipation Factor DF: 6
Lead Spacing: 4.400mm
Leakage Current: 24 uAmps
Ripple Current: 0.438 mAmp
http://www.ebay.com/itm/AVX-Tantalum-So ... VWDCQ3MHow
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Re: Motherboard Polymer Chip Capacitor replacement

Postby Karlsweldt » Thu Sep 29, 2016 11:29 am

Did almost 1/2 hour searching for specs on that original capacitor. Nothing good found. If the original was in Picofarads, and the tech put one in with Microfarads, then it is way over the design specs!
T520D476M016ATE035 (datasheet.pdf) refers to the "157" as having first and second digits in Picofarads value, with the third digit as the number of zeros following.. or about 150 Microfarads equal.
At this point, I would try to get info from the motherboard manufacturer as to the specs on it. Or find another similar board that is DOA and salvage the needed part.
Capacitance Conversion Reference: http://www.convertunits.com/from/microf ... /picofarad
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Re: Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Thu Sep 29, 2016 2:44 pm

Thanks man, i salvaged matching chip from another board and reinstalled. Didn't try it yet, CPU heatsink is in bad shape , need to be buffed.
Wire with small plastic on motherboard is little pulled on that spot , can i use SUPERGLUE or CRAZYGLUE ?
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Re: Motherboard Polymer Chip Capacitor replacement

Postby Karlsweldt » Fri Sep 30, 2016 4:42 am

I would not trust that type of OTC glue on electrical circuits. There are special types for use with electronics, but not easy to obtain. Would be better if thinned contact cement were used. Best would be a drop of hot-melt glue to hold the component in place after soldering, with a short lead of insulated wire to the other end of that trace. Those traces are only a few mils thick, and can become weak or break if distressed.
Decades ago, some motherboards had jumpers soldered here and there.. to repair faulty traces. Better than in the trash bin.
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Re: Motherboard Polymer Chip Capacitor replacement

Postby GEORGIAN » Tue Oct 04, 2016 4:43 pm

Thanks, will do.
Any idea what should cause BSOD's ?
SSD ? MEMORY ? CPU Overheating?
MOB by itself? Before DELL replaced Motherboard i had no BSOD's.
I'm guessing SSD because sometimes i need to restart 3-4 times PC before to get to O.System load.
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